Bathroom Duct To Attic Vent

From up on the roof use a jigsaw or reciprocating saw to cut a 4 in.

Bathroom duct to attic vent. Try to keep it close to the fan location. A 3 or 4 inch duct connects to the outlet on the fan housing and runs to a side wall or to the roof and connects to a vent cap that allows the exhaust to disperse outdoors. Each bathroom has its own exhaust fan. The bathroom exhaust ventilation fan disperses air through an opening in the fan housing which is usually 3 inches in diameter and ideally faces in the direction of the ventilation system outlet.

A lot of options. The exhaust vent must terminate outdoors. One in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms. So what you want to do is you want to install a duct a vent duct and you can use flex duct for this.

When venting a bathroom exhaust fan make sure to vent the air to the outside rather than into your attic where it can cause mold and mildew to form. Each fan vents separately out the roof. Start in the attic and drill a hole through the roof in the desired vent location. Mount the fan high on the wall to better capture warm moist air.

Fabricate the duct run from rigid metal or pvc material. Options for venting a bathroom exhaust fan include best to worst. Now where the discharge point is is going to be up to you. Ask your hvac contractor about fabricating a duct run that extends from a fan mounted in a bathroom wall down through the floor and between floor joists out to an exterior wall.

That will take it from the bath exhaust fan to a discharge point. Both bathrooms are vented by a single in line fan that has one exhaust vent running through the roof. Do not simply terminate a bath vent fan duct in an attic as shown in our photo above nor can you just dump the exhaust vent into a crawl space nor into a closed wall floor or ceiling cavity. Through the roof or an exterior gable wall.